Question

Figure 29-83 shows a cross
section of an infinite conducting sheet carrying a current per unit
x-length of λ; the current emerges perpendicularly out of the page.
(a) Is the magnetic field parallel to the sheet and directed as
shown (for all points P above the sheet and all points P' below it.
Use the Biot–Savart law and symmetry.)? (b) Use Amper's law to find
the expression for magnetic field.